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    • 17. 发明专利
    • Clock frequency division device
    • 时钟频段设备
    • JP2013046268A
    • 2013-03-04
    • JP2011183250
    • 2011-08-25
    • Sanyo Electric Co Ltd三洋電機株式会社
    • IDE HIROYUKI
    • H03K21/00G06F1/04H03K5/00
    • H03K21/026H03K21/12
    • PROBLEM TO BE SOLVED: To match frequency division action start timings of a plurality of frequency division circuits under loose constraint conditions.SOLUTION: A gate signal generation circuit 14 receives at an input point F a reset signal to be input into reset signal input points B and C of frequency division circuits 11 and 12, and outputs as a gate signal a signal delayed from the reset signal at the input point F by several clock cycles. A gate circuit 13 determines whether or not to output a source clock input thereinto from an output point h in accordance with the gate signal. The source clock output from the output point h is input as a gated clock into clock input points b and c of the frequency division circuits 11 and 12. The reset signal is delayed for gate signal generation and gate circuit control such that the source clock (gated clock) is input into the input points b and c after the reset signal to the input points B and C cancels resetting of the frequency division circuits to permit frequency division actions of the frequency division circuits.
    • 要解决的问题:在松散约束条件下匹配多个分频电路的分频动作开始定时。 解决方案:门信号产生电路14在输入点F接收要输入到分频电路11和12的复位信号输入点B和C的复位信号,并作为门信号输出延迟从 复位信号在输入点F几个时钟周期。 门电路13根据门信号确定是否从输出点h输入其源输入时钟。 从输出点h输出的源时钟作为门控时钟输入到分频电路11和12的时钟输入点b和c中。复位信号被延迟用于门信号产生和门电路控制,使得源时钟( 门控时钟)输入到输入点b和c之后,输入点B和C的复位信号取消分频电路的复位,以允许分频电路的分频动作。 版权所有(C)2013,JPO&INPIT
    • 18. 发明专利
    • Clock frequency dividing circuit
    • 时钟分频电路
    • JP2012014497A
    • 2012-01-19
    • JP2010150929
    • 2010-07-01
    • Fujitsu Semiconductor Ltd富士通セミコンダクター株式会社
    • KUME TAKAYUKI
    • G06F1/08H03K21/00
    • G06F1/08H03K21/026H03K23/667
    • PROBLEM TO BE SOLVED: To improve the performance of a system carrying a clock frequency dividing circuit by simultaneously switching a frequency dividing ratio of multiple clocks.SOLUTION: A clock frequency dividing circuit comprises: multiple frequency dividers capable of setting a frequency dividing ratio of clock externally; a preset register group; and a selector. The preset register group stores a frequency dividing ratio to be set to the frequency dividers. The selector selects one preset register from the preset register group and gives the frequency dividers the frequency dividing ratio stored in the selected preset register. The selecting operation by the selector makes it possible to simultaneously switch the frequency dividing ratio of multiple clocks and then to improve operation efficiency of a circuit block to which the clock frequency dividing circuit is supplied.
    • 要解决的问题:通过同时切换多个时钟的分频比来提高携带时钟分频电路的系统的性能。 解决方案:时钟分频电路包括:能够外部设置时钟分频比的多个分频器; 预设寄存器组; 和选择器。 预置寄存器组存储要分频器设置的分频比。 选择器从预设寄存器组中选择一个预设寄存器,并给出分频器存储在所选预设寄存器中的分频比。 选择器的选择操作使得可以同时切换多个时钟的分频比,并且提高提供时钟分频电路的电路块的操作效率。 版权所有(C)2012,JPO&INPIT